andrew



3 Sheets-Sheet 1.

(No Model.)

0. H. ANDREW.-

GAS ENGINE.

Patented Mar. '24, 1885.

M MW @MM N PETERS, Phnko-Ll'fmgmpller, Waihinglcll. DQ

(No Model.) 3 Sheets-Sheet 2.

0. H. ANDREW.

GAS ENGINE. No. 314,284. Patented Mar. 24, 1885.

N ETERS. Phnlolimogmphcr. Washmglon. n c.

(No Model.) 3 Sheets'Sheet 3.

G. H. ANDREW. GAS ENGINE.

No. 314,284. Patented Mar. 24, 1885.

F l G- 5 7 I Unites States PAT NT Caries.

CHARLES HENRY ANDRE\V, OF STOCKPORT, COUNTY OF CHESTER, ENGLAND.

GAS-ENGINE.

SPECIFICATION forming of Letters Patent No. 314,28 dated March 24,1885.

Application tilt d March 8, 1894. (No nu dbl.) Patented in England Se. tember 6, 53, No. 4,291.

To all whom it 77mg concern.-

Be it known that 1, CHARLES HENRY AN- DREW, a subject of the Queen of Great Britain, residing at Stockport, in the county of Chester,

England, have invented a new and useful Improvement in Gas-Engines, (for which I have obtained a patent in Great Britain, No. 4,291, bearing date September 6, 1883,) of which the following is a specification.

My invention relates to those gas-engines in which the combustible charge of gas and air is exploded when under considerable pressure; and the object of my improvement is to relieve the slide-valve of the pressure resulting from the compression and explosion of the charge. I attain this object by fitting a checlvvalve in the passage between the combustion chamber of the Working cylinder and the slide-Valve in the manner illustrated in the accompanying three sheets of drawings, in which Figure l is a side vertical section through the lineD E, Fig. 2, and Fig.2 is an endvertieal section through the line A B, Fig. 1, ofth'eslidcvalve and combustionchamber of the powercylinder ofa gas-engine. Fig. 3 is aplanview ot' the valve-cover, and Fig. 4 is a plan view of the valve-cover and ot'the slide-valve. and Fig. 5 is a plan view of the slide-valve, all the last three views being on a reduced scale.

Similarletters refer to si milar parts throughout the several views.

In these views a isthe combustion-chamber of the power-cylinder a of a gas-engine. The explosive charge of gas and air mixed is conducted under pressure from the charging or compressing cylinder (not shown in the drawings) when a separate charging-cylinder is employed, or when onlya single cylinder is employed is drawn through the pipe reservoir or passage 2) and passage b to the slide-valve c, and is admitted through the passage and space a to the combustion'chamber a, and so to the power-cylindera,in the followingmanner: The slide-valve c is formed with a port, 0, and when the piston (not shown in the drawings) in the power-cylinder a is near the end of its outstroke one end of this port 0 comes opposite the passage 2), and the other end of the port comes opposite the passage a, thus opening a communication between the pipe or passage 1) and the passage a,leading to the combustion-chambera. The ehargeis drawn, or, if under pressare, rushes from the pipe or passage 1) through the passage 1), port 0', and passage a, lifts the mushroom check-valve (I, and passes into the combustion-chamber a. The spring (1' on the valvespindle is used to assist in closing the mushroom el1eck-valve d as soon as the charge has passed into the chamber a and cylinder a,

and thus the main charge in the combustion- 6o is taking place, the hole e in the slide-valve c 6 comes over the passagef in the valve-coverg, and gas is thus allowed to pass from the supplypipe f through the passage f and the hole 6 along the slot 6" into the pocket 0, where it is ignited atthe master-lighth by means of a cur- 7o rent of air admitted through the opening h" in the valve-coverg. The master-light! is kept constantly burning in the chimney h in a division of or near the combustion-chamber a.

XVhen the piston in the power-cylinder a has compressed the main charge into the combustion-chamber a, and a moment before the piston begins its reverse or out stroke, the slide valvec will have moved in the right-hand direction and be in the position shown in Figs. 1

and 2, and as the valve continues its traverse the explosive mixture in the passage and space a between the under side of the mushroom check-valve d and the slidevalve c is ignited and exploded by the flame in thepoclret c. This preliminary explosion raises the mushroom valve d and explodes the main charge in the combustion-chamber a. The mushroom checkvalve (1 is instantly closed by the force of the explosion and thus relieves the slide-valve 0 9O of all pressure from and protects it from any injury by the explosion in the combustionchamber a. Vhen the slide-valve 0 again moves in the left-hand di rectiomthe waste gases in the ignition-pock et e escape through a small pipe, 5

f", in the valve-cor'erg previous to the pocket 6 receiving a fresh supply of gas.

I havedescribed and shown a mushroom check-valve; but any suitable kind of checkvalve may be employed.

I am aware that it is not broadly new in gasengines to interp ose a eheoleval ve between the IOO slide-valve and the combustion-chamber; and therefore I do not broadly claim such a construction or combination.

I am further aware that spring-held valves for controlling the admission of gas to the slide valve and for allowing its escape from the combustion chamber are old. These I neither show nor claim.

I am also aware that slide-valves having passages for the admission of gas to the cylinder or combustion-chamber, its ignition and its escape from said cylinder are not new. These, therefore, I do not broadly claim; but

What Iclailn as new, and desire to secure by Letters Patent, is

In combination with the slidevalve and the explosion-cylinder of a gas-engine, a springheld mushroom valve, d, which closes the passage between them, a preliminary explosion chamber or space formed between said slide 20 valve and said mushroom valve, aburning jet, and an ignition pocket and passage whereby said jet ignites the gas in the preliminary explosion-chamber, blowing open the mushroom valve dand exploding the charge in the 25 main explosioncylinder, whereby said valve (Z is immediately closed, substantially as set forth.

The foregoing specification of my improvement in gas-engines signed by me this 20th 20 day of February, 1884.

CHARLES HENRY ANDREW.

Witnesses:

JOHN WM. MARGESON,

26 Avenue Street, Portwood, Sfoekport. P. HIoKsoN,

46 Hall Street, Stoekport. 

